A pronoun is an important part of speech .It help us to skip name and we can use [He,she,it ,I,we ,they,you ]instead of that person.
For example: Asad is my brother .Asad gets up early.Asad does his breakfast then go to work.
We can use pronoun like
Asad is my brother.He gets up early in the morning .He does his breakfast and then go to work.
A pronoun help to make sentence clear .we can use pronoun to avoid repetition of a noun.